Method for increasing signal to noise ratio of capacitive touch device and capacitive touch device and touch panel using the same

A touch panel and touch technology, which is applied to capacitive sensors and capacitive touch panels, increases the signal-to-noise ratio of capacitive touch devices, and can solve the problem of insufficient signal-to-noise ratio, changes in charging and discharging times, etc. question

Inactive Publication Date: 2016-02-03
GENERALPLUS TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When a finger touches the capacitive touch panel, part of the electric field will be absorbed by the finger, which will cause a change in the charging and discharging time
[0009] However, this method is indeed feasible for flat touch surfaces with low thickness, but once the thickness of the touch panel increases (more than 3mm), the traditional low-amplitude (3.3V) square wave will suffer due to signal-to-noise ratio ( SNR) is dwarfed by the

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  • Method for increasing signal to noise ratio of capacitive touch device and capacitive touch device and touch panel using the same
  • Method for increasing signal to noise ratio of capacitive touch device and capacitive touch device and touch panel using the same
  • Method for increasing signal to noise ratio of capacitive touch device and capacitive touch device and touch panel using the same

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[0048] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

[0049] figure 2 A circuit diagram of a capacitive sensor according to a preferred embodiment of the present invention is shown. Please refer to figure 2 , the capacitive sensor includes a first sensing electrode 201 , a second sensing electrode 202 , a resonant inductor 203 , a detection wave generation circuit 204 and a touch detection circuit 205 . In order to allow those skilled in the art to understand the present invention, in this embodiment, a node N20 and an equivalent capacitor 206 are additionally shown.

[0050] In this embodiment, in order to avoid the inability to sense due to the increase of the glass thickness, and to increase the touch sensitivity without increasing the output voltage of the detection wave generating circuit 204, in this e...

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Abstract

A method for increasing a signal to noise ratio of a capacitive touch device and a capacitive touch device and a touch panel using the same are provided. The capacitive touch device includes a first sensing electrode, a second sensing electrode, a touch detector, a resonant inductor and a detection signal output circuit. An output terminal of the detection signal output circuit outputs a detection signal, such that the resonant inductor and an equivalent capacitor of the first sensing electrode are resonant, and the first sensing electrode receives a resonant sinusoidal wave. When an electric field signal detected by the detecting terminal of the touch detector is smaller than a preset value, it is determined that the capacitive touch device is touched.

Description

technical field [0001] The present invention relates to a capacitive sensing technology. More specifically, the present invention relates to a method for increasing the signal-to-noise ratio of a capacitive touch device and a capacitive sensor and a capacitive touch panel using the same. Background technique [0002] A touch panel is generally a device attached to a liquid crystal display or a notebook computer. Its function is to allow ordinary people to press the options on the touch panel with a finger or a stylus to complete the operation. Data transfer or read information on the screen. Touch panels can be used in a wide range of applications, including: [0003] (1) Portable information, consumer electronics and communication products: such as PDA, tablet computer, digital camera, information appliance, 3G mobile phone, etc.; [0004] (2) Financial or commercial purposes: such as cash machines, sales systems, remote video conferencing, telephone terminal systems; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
CPCG06F3/04166G06F3/0446G06F3/044
Inventor 罗立声杨治原
Owner GENERALPLUS TECH INC
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